Twenty participants of the language course started their tour of the world’s largest computer museum about 5,000 years before the onset of the computer era with the cuneiform writing of the Sumerians, who had thus developed an way to save their data on clay tablets. On her way through the historic development of computer technology, Diedlinde Stach of the Heinz Nixdorf MuseumsForum first showed the participants mechanical calculation aids and calculating machines before moving on to the computers. The calculation aids and calculating machines allowed a further increase in the calculation speed. Diedlinde Stach (1st from the right) explained the operating mode of an abacus which is still being used in China today. An experienced user can carry out calculations with an abacus much faster than with a hand-held calculator. In the computer department of the museum, she showed the students milestones such as a vacuum-tube computer the size of a room or the first computers designed by Apple in the 1970s for personal use.